Roof Exhaust Fan

This manual is to assist the engineer to avoid the most common fan problems caused by improperstorage, installation, operation and maintenance. HANDLING AND MAINTENANCE SHOULDALWAYS BE PERFORMED BY EXPERIENCED AND TRAINED PERSONNEL.RECEIVING, HANDLING AND STORAGERough handling during shipment and improper storage can cause damage that is not noticeable until thefan is in operation. This can be avoided with proper storage and handling techniques.Fan should be hoisted with slings placed around the fan housing. Touch up the scratch coated surfacesduring lifting, to prevent corrosion to occur at this area. Store the fan in a clean and dry place,preferably indoor to ensure fan shaft, bearing and fan casing are protected against dust and corrosion.Do not store the fan in a location where it will be subjected to vibration. This can cause the internalsurface to rub against each other and damage the bearings.START-UP CHECK LISTBefore putting any fan into initial operation the manufacturer’s instruction must be followed. Completethe following checklist to make sure that the fan is ready to run. Lock out the primary and all secondary power sources. Make sure the foundation or mounting arrangement and the ductconnections are adequately designed in accordance with recognizedacceptable engineering practices and with the fan manufacturer’srecommendations. Check and tighten all hold-down (securing) bolts. Check the fan assembly and bearings for proper grounding to prevent staticelectricity discharge. Spin impeller to see whether it rotates freely and is not grossly out ofbalance. Inspect impeller for correct rotation for the fan design. Properly secure all safety guards. Switch on the electrical supply and allow the fan to reach full speed.Check carefully for :- (1) Excessive vibration(2) Unusual noise(3) Proper amperage and voltage valuesIf any problem is indicated, SWITCH OFF IMMEDIATELY. Lock out theelectrical supply, secure the fan impeller if there is a potential for windmilling. (impeller turning due to a draft through the system).Check carefully for the cause of the trouble and correct as necessary.The fan may now be put into operation but during the first 8 hrs of running, it should beperiodically observed and checked for excessive vibration and noise. Checks should be make ofmotor input current and motor & bearing temperature to ensure that they do not exceedmanufacturer’s recommendation. After 8 hrs of operation, the fan should be shut down to checkthat all set screws and hold-down bolts.